Me either. 3.0 was removed from my machine. I don't think we actually know which 64 bit windows OS Mountainmaster is using.
You're right - it might be Vista. However (in theory) that shouldn't be different.
Or perhaps Morgan has updated the installer? Did you do a fresh download of the installer?
I'm presuming (?) that you had originally used the Prolific installer version to put 3.0 on this machine, and that it worked correctly.
At any rate, testing Morgan's installer presumably isn't a purpose of this forum. I was just curious.